Center and tool-holder.



C. H. NORTON CENTER AND TOOL HOLDER.

APPLICATION FILED ocr.24.191s.

1 61,157 Patented Apr. 2, 1918.

E25 WW Ell rnrnnr NDRTON, OF WORCESTER, MASSACHUSETTS, ASSIGNDB T NORTONGBINDING'CQIvIPANY, 0F WORCESTER, MASSACHUSETTS, A CORPORATION 035MASSACHUSETTS.

CENTER ID TOOL-HOLDER.

Specification of Letters Patent.

Patented Apr. 52,

Aliplicaticn filed October 2%, .1916. Serial No. 12?,395.

To all whom it may concern:

Be it known that 1, CHARLES H. NORTON, a citizen of the United States,residing at ll orcester, in the county of lVorcester and Stateofldassechusetts, have invented a new and useful Center and Tooldlolder,of "win ch the following is specification.

This invention relates to a combined center and tool holder particularlyadapted to support a diamond tool for dressing n grinding Wheel in acylindrical grinding machine.

' t is of the greatest importance in grind ing cylindrical Work that theWheel should be faced exactly parallel to the axis of the work centers.It is not always possible, even at great labor vand expense, to securean exact parallel relation both horizontally and vertically between thegrinding Wheel shaft and the unis of the Work centers, butthe'ohjectionzible results of defective alinewent way be entirelyeliminated by facing the grinding Wheel exactly parallel to the axis ofthe Work centers at the cutting point. If the Wheel shaft and the or thecon ters are not parallel, this parallel facing of the grinding Wheelcan only be accurately accomplished by the use of a tool moving with thecenters and. Work table, and held in the horizontal plane of thecenters. Otherwise the Wheel will be faced at a slight angle to axis ofthe Work centers, and will consequently leave a slight siirul depressionin the finished Work, this depression being cut by the high corner ofthe Wheel.

It is the object of my invention to provide an improved device for thusholding it diamood or facing tool at the level of the Work axis, soformed that the cutting point Will always be positioned at this level.More specifically, it is the special object of my invention to 'cro videan integral Work center end tool holder designed to support the tool bythe Work center With its cutting point in the horizontal plane ofthe'center.

As herein shown I provide a center having an enlarged shank held fromrotation or singular movement and having a. hole extending horizontallytherethrongh Within which the cylindrical body of a diamond tool may heconveniently adjusted longitu- .dinelly.

Further features of my invention relate to certain arrangements andcombinations of which Wlll he llfil'elfiitfilfil described and moreparticularly pointed out in the appended claims.

A preferred form of my invention is shown inthe drawings, in Wl1lCl1-Figure 1 is a top plan view of my improved center and tool holder;

Fig. "2 is a side elevation of the device shown in Fig. 1, and

Fig. 3 is a sectional view thereof tokenv along the line 33 in Fig. 2-.

Referring to the drawings, l have indicated ut the foot stock of i1grinding machine in Which av center 11 has a tapered hearing. The centeris held in fixed angular position in the foot stock by a key 12 mountedin the center and fitting in a key-Way 13 in the foot stock. The work isindicated at K and the Wheel at ll.

The center 11 is provided with an en lsrged shank portion 11 and is cutaway on one side to permit the grindingwheel to or preach moreclosely tosmall Work. A transverse hole it is formed in the enlarged shank portion11 and s diamond tool 15 fits loosely Within the hole 14. The hole l-flis so formed that it will .loe excctlyhort Zontol when the spindle isinserted in the foot stock with the key 12 fitting in the how I Way 13.

A bushing 16 1S threaded into the center 11 otright angles to-the holell, and is threaded to receive a binding screw 1! on tending through thebushing into position to engage the tool 15 ll ith this construction itwill he seen that the tool I5 may be inserted or removed from the workcenter 11 at Will, may project at greater or less distance through thecenter, but in ell operative positions the cutting point will he planeof the work centers. The wheel W Will therefore be faced exactlyparallel to the Work centers and in the exact plane of the cuttingoperation. The bushing; 16 is provided for replacement Whenever theinnor thread becomes Worn and screw 17 becomes loose.

While the device has been shown as ap plied to a. foot stool: it. willof course be evident that it can be used equally well in a. head stock.1 v

Having thus described-my invention it Will be evident that changes andmodifications can be made therein withont departing from in thehorizontal.

lllll Era the spirit and scope thereof as set forth in. the claims, andI do not \VlSil to other wi limited to the details herein disdosed, butwhat I claim is:---

1. 1n. a grinding machine, it grindin wheel, it work center, a :incingtool, and means to sup ort seid facing tool in fixed relation t0 SiLlcenter with the cutting point of said tool substantially in the connnonplane of the axes of said wheel and center.

2. In a grinding machine, a grinding wheel, 11, facing tool, and itcombined center and facing tool holder comprising :1 center and means tosupport e. tool (liorelw', said tool being ioi'igitndiimlly uiljiistnbleout inning its working point always positioned in the plane of the axesoi? said center and. grinding wheel.

In a grii'iding. ll'lilCllillO :L grinding wheel, it work support. acenter, means to position Said center in a 11 redeiermined zingulnrrelation to said work i-rnp i ort, ii inch 2" tool adjustable along aradius of said cen tei' and means to secure said tool in Rd," jnstedposition.

4. In a grinding machine, n, wheel, at work center, means to position eni. center at a fixed iingie in said nmcliine, said center having anopening itending trims-- grinding;

eonie? i'ei-sely through its axis and substantially pnrofiiei to at linejoining; the axes oi said center and wheel. n facing tool longitudinallyadjustable in said opening, and means to secure said tool in. adjustedposition.

A combined center and facing tool holder comprising a, center having anenlarged shank portion with a transverse opening through the axis oi":said center adapted to receive it facing tool, and means to secure saidtool in adjusted redial position, said izubter means including itbushing threaded into the shank of satin. center and a binding vtl'n'eiided into said bushing and en- 115;: said. tool,

' t in :1, machine for grinding cylindrical surface" a. grinding wheel,it w rk supportingnter determining the surf LCVQLOIE iz'eyoluiionproduced by grinding, a n lieeildressing devicq and means to supportsaid device in position to dress said grinding wheel and in radial.niinonient between the centers of rota.- tion of the worir and wheel,thereby dressinn the wheel face at the line of grinding cent-net endparolle with the axis of the work snppmsting center.

In testimony whereof I have hereunto afiiiied my signature @HAHL 1S H.NORTON

